kao193

Dear Experts, First of all thank you for your past posts, I found this forum invaluable and full of useful tips. Keep up the good work. I have been asked to supply a CCTV system to secure a 300m x 300 m fence against intruders from outside. The offices where the control room is located are roughly in the middle of the yard and are 10m x 10m Fence height is 4.5 m and there is some lighting at night (floodlights). The area is generally remote and outside traffic is minimal. Yard contains large fuel metal tanks. Being a non specialist (electrical power engineer) I read around the subject and so far came the following conclusions: 1- Wireless system (which is my preferred option) is not suitable due to the distance between the control room and cameras (over 200m) and the fact that no internet is available. 2- I will need to use a wired DVR system with either RG6 cable or UTP + active Balun. (please advise which is more suitable and easier to install) 3- I will need to use outdoor weatherproof static cameras with IR & motion detection capabilities but I am not sure about number of cameras required, mounting height, pointing direction and whether I need lenses. The site is in Africa, temp is around 50 deg C and atmosphere is generally dusty & dry. Feel free to recommend makes & models. Many thanks Khalid

Dear John, Thank you for taking the time to respond to my post. I have submitted my design before seeing your post but below is a brief outline. I have used 4 x Bosch Autodome 500i PTZs with 36 zoom one at each corner (Bosch product no VG4-514-ETS) I have opted for Pole (roof) mounting (Bosch item no VG4-A-9230). As this will mount the cameras above the fence and enable the cameras to monitor both outside & inside yard (although strictly inside is not a requirement). Cameras have advanced features including motion detection, guard tours & auto tracking (check autodome on youtube). Re your design ------------------- I can see the wisdom of using 2 camera /side pointing left & right as this will avoid duplicate coverage. One of the options I offered was to use 3 fixed cameras (Swann Maxi) per side going into a clockwise direction. So thanks I will bear this in mind next time. Re Wireless -------------- You are right, there are systems upto several kilometers but initially I thought wireless referred to Ieee 802.11g systems. Later on I came across 900Mhz & 5.8GHz systems offered by AvalanWireless and Radio Contact from UK (rdcon) which provide both Line of site & Non LOS systems for up to several kms. However the presence of large fuel metal tanks can bounce back the signals and hence I am not sure if this will work. Transmission Distance ----------------------- After much research I concluded that max distances per transmission medium are as follows: RG- 59 cable is suitable for distances upto 800 ft or 250 m RG-6 not sure but more than RG-59 RG-11 For distances upto 2500 ft or 800m Twisted Pair up to 3000m (up to 20 km with repeaters) however max resolution can only be 400TVL Microwave 1km to 30 km depending on how powerful the sender is Further questions --------------------- - I am looking for good quality & value 330ft infra red illuminators any recommendations are welcome. - If I use an NVT balun and UTP cable with a non IP camera can I still transfer video & PTZ control (pelco compatible)? - Other than safety are there any advantages in using 24V instead of 230V (our equivalent of your 110V)? - The autodome has Lens with 36x Zoom (3.4 –122.4 mm) F1.6 to F4.5 What should be my default setting? - I think I will need some sort of conduit to protect the cable running along the chain link fence, any recommendations would be appreciated. - The cameras have a guard tour feature what are the best settings / duration to utilize this option. - Is there a good book/course you would recommend If I need to learn more about CCTV system design (site survey, location of cameras etc..)? Many Thanks, Khalid